Are there any considerations needed to be taken running your .net program on x64 vs x86?

Question

I believe the architecture type (x86 vs x64) is abstracted away for you when making .Net programs, but are there any other considerations that can cause problems?

Answer 1

From the MSDN doco, among other considerations:

In many cases, assemblies will run the same on the 32-bit or 64-bit CLR. Some reasons for a program to behave differently when run by the 64-bit CLR include:

• Structs that contain members that change size depending on the platform, such as any pointer type.

• Pointer arithmetic that includes constant sizes.

• Incorrect platform invoke or COM declarations that use Int32 for handles instead of IntPtr.

• Casting IntPtr to Int32

Also, default file locations.